class SAML2::Subject::Confirmation

def build(builder)
  builder['saml'].SubjectConfirmation('Method' => method) do |subject_confirmation|
    if in_response_to ||
        recipient ||
        not_before ||
        not_on_or_after
      subject_confirmation['saml'].SubjectConfirmationData do |subject_confirmation_data|
        subject_confirmation_data.parent['NotBefore'] = not_before.iso8601 if not_before
        subject_confirmation_data.parent['NotOnOrAfter'] = not_on_or_after.iso8601 if not_on_or_after
        subject_confirmation_data.parent['Recipient'] = recipient if recipient
        subject_confirmation_data.parent['InResponseTo'] = in_response_to if in_response_to
      end
    end
  end
end